Date: Wed, 2 May 2001 14:14:29 -0700 (PDT) From: Matt Dillon <dillon@earth.backplane.com> To: Valentin Nechayev <netch@iv.nn.kiev.ua> Cc: stable@FreeBSD.ORG Subject: Re: Strange BTX halted error Message-ID: <200105022114.f42LETo95078@earth.backplane.com> References: <Pine.BSF.4.33.0105011046470.30516-100000@sdmail0.sd.bmarts.com> <200105011806.f41I6UN69612@earth.backplane.com> <20010502110520.B340@iv.nn.kiev.ua>
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:...
:> dangerously dedicated partitions. It's what prompted me to fix the
:> disklabel code to allow boot blocks to be installed on slices.
:> Unfortunately, the only way I could fix my particular problem was
:> to get rid of my dangerously dedicated partition which meant blowing
:> away the hard drive and repartitioning and relabeling it.
:
:If disk is `dangerously dedicated', sector 0:0:1 is occupied with boot1,
:which does not use master PT area (0x1BE-0x1FF) and even contains
:a simple fake valid PT. Did you ever try to set there something syntactically
:valid for your BIOS and enough to allow loading of specific "bootloader"?
:If you did, what was the problem?
Yah, I tried that... didn't work. What did work was blowing away
(zeroing) the beginning of the disk and then re-partitioning it
from scratch using a real DOS disk partition and boot0 (using fdisk -BI),
and installing boot1 and boot2 on the FreeBSD slice with disklabel's
new ability to install boot sectors on slices, using
'disklabel -w -r -B da0s1 auto'. That worked. I incorporated the
sequence into the disklabel manual page near the end of the EXAMPLES
section.
:P.S. On our FreeBSD hosts bunch we almost proved practically that the
:only safe partitioning is to create DOS slices (with below-cyl-1024
:bootable one) with LBA geometry specified to fdisk. Any another approach
:leads to something strange effects: e.g. BTX cannot load /boot/loader
:and loads kernel directly, with natural `nlist failed'. But we never
:tried to change fake PT on dedicated disk directly.
:
:/netch
I haven't had to do that. Yet.
-Matt
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